| 基于6S模型的MODIS影像逐像元大气校正及其应用 |
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| 引用本文： | 徐言,姜琦刚.基于6S模型的MODIS影像逐像元大气校正及其应用[J].吉林大学学报(地球科学版),2015,45(5):1547-1553. |
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| 作者姓名： | 徐言 姜琦刚 |
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| 作者单位： | 吉林大学地球探测科学与技术学院, 长春 130026 |
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| 基金项目： | 中国地质调查局项目(1212010510613) |
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| 摘 要： | 以获取地物真实反射率为目的,介绍了逐像元大气校正的方法。应用6S模型逐像元综合考虑太阳天顶角、传感器天顶角、相对方位角、大气气溶胶厚度、观测波段以及地表海拔这6个参数,生成查找表,统计分析各参数关于反射率的敏感度;并与以往单一参数校正的方法比较了校正的效果。结果表明,逐像元大气校正算法更加接近地物的真实反射率。利用MODIS地表反射率产品对大气校正的结果进行验证,单一参数、逐像元大气校正的相对误差分别控制在26.9%和12.7%以内;在以植被指数(NDVI)为例的后续遥感定量化反演过程中,逐像元比单一参数大气校正方法计算的NDVI平均高出14.4%。
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| 关 键 词： | 逐像元 6S 查找表 大气校正 |
| 收稿时间： | 2015-01-17 |
A Pixel by Pixel Atmospheric Correction Algorithm and Its Application for MODIS Data Based on 6S Model |
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| Xu Yan,Jiang Qigang.A Pixel by Pixel Atmospheric Correction Algorithm and Its Application for MODIS Data Based on 6S Model[J].Journal of Jilin Unviersity:Earth Science Edition,2015,45(5):1547-1553. |
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| Authors: | Xu Yan Jiang Qigang |
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| Institution: | College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China |
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| Abstract: | In order to obtain the real reflectance of earth objects ,we introduced a new method to correct atmospheric parameters pixel by pixel . Considering with the six parameters ,including solar zenith angle ,sensor zenith angle ,azimuth angle ,aerosol optical depth ,observation band ,and surface elevation ,we applied the 6S model pixel by pixel to generate a lookup table for analyzing the sensitivity of each parameter to reflectance ;and compared the correction results with the ones by the old method using single parameter .The results show that the reflectance by 6S model pixel by pixel is much closer to the true reflectance of objects .By using the MODIS surface reflectance products ,we verified the accuracy both of the 6S model pixel by pixel and the single parameter method ,and found that their relative errors are 12 .7% and 26 .9% respectively .Taking vegetation index (NDV I) as an example for the subsequent quantitative remote sensing inversion ,the NDV I by 6S pixel by pixel method is 14 .4%higher than the single parameter atmospheric correction method . |
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| Keywords: | pixel by pixel 6S lookup table atmospheric correction |
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